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  1. import java.lang.reflect.*;
  2.  
  3. class Ideone {
  4.   private static Ideone instance = new Ideone();
  5.  
  6.   public static Ideone getInstance() {
  7.     return instance;
  8.   }
  9.  
  10.   private static final Integer VALUE = new Integer(0);
  11.  
  12.   public Integer getVALUE() {
  13.     return VALUE;
  14.   }
  15.  
  16.   private static final Integer NB_ITERATION = 1_000_000;
  17.  
  18.   public static void main(String[] args) {
  19.     for (Integer i = 0; i < NB_ITERATION; i++) {
  20.       setStaticFieldValue(Ideone.class, "VALUE", i);
  21.  
  22.       Integer value = Ideone.getInstance().getVALUE();
  23.       if (!i.equals(value)) {
  24.         System.out.println("REFLECTION DID NOT WORK for iteration " + i + " vs " + value);
  25.         break;
  26.       }
  27.       //System.out.println("iter " + i + " ok");
  28.     }
  29.   }
  30.  
  31.   private static void setStaticFieldValue(
  32.       final Class obj, final String fieldName, final Object fieldValue) {
  33.     try {
  34.       final Field field = obj.getDeclaredField(fieldName);
  35.       field.setAccessible(true);
  36.       final Field modifiersField = Field.class.getDeclaredField("modifiers");
  37.       modifiersField.setAccessible(true);
  38.       modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
  39.       field.set(null, fieldValue);
  40.     } catch (NoSuchFieldException | IllegalAccessException e) {
  41.       throw new RuntimeException(
  42.           "Error while setting field ["
  43.               + fieldName
  44.               + "] on object "
  45.               + obj
  46.               + " Message "
  47.               + e.getMessage(),
  48.           e);
  49.     }
  50.   }
  51. }
  52.  
Success #stdin #stdout 0.05s 2184192KB
comments (?)
stdin 
Standard input is empty
stdout 
REFLECTION DID NOT WORK for iteration 256 vs 255
https://ideone.com/bZ7nmR
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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